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RISS 인기검색어
- 검색키워드
- 저자 : Datta Pritha (검색결과 2 건)
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Assessing the changes in climate extremes over Karbi Anglong district of Assam, North-East India
Datta Pritha,Bose Sahana 대한공간정보학회 2020 Spatial Information Research Vol.28 No.5
The changes in the climate extremes are not only an important indicator of climate change but also their spatio-temporal pattern influences the occurrence of droughts, floods, soil erosion, landslides as well as the livelihoods of the human beings. Therefore the present study tries to investigate recent changes in climate extremes using eight indices developed by the Expert Team on Climate Change Detection and Indices for the Karbi Anglong district of Assam situated in North-East India. This district has gone through several changes in the land use and land cover which is one of the significant factors for bringing changes in the regional climatic conditions. A non-parametric Mann–Kendall test, Modified Mann–Kendall test and Theil–Sen’s slope estimator are used to analyze the trends and trend magnitudes of the extreme indices of temperature and precipitation. The results show that there is an increase in the frequency of the warm days and nights, along with the presence of long dry spells, increasing extreme precipitation events with high intensity throughout the district for a period of 35 years. These changes in the climate extremes can have severe impacts on the availability of water resources which can affect the agricultural activities and reduce the availability of drinking water facilities for the tribal communities.
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Analysis of long-term seasonal and annual temperature trends in North Bengal, India
Pritha Datta,Soumik Das 대한공간정보학회 2019 Spatial Information Research Vol.27 No.4
In the recent past, scientific modeling of climatic elements, in particular, temperature data has attained considerable importance as it affects many aspects of the environment and also indicates a clear sign of climate change. The temperature warming is mainly associated with the increasing concentration of greenhouse gases triggered by the land use and land cover changes. In the last century, exploitation of forest resource, population influx, and expansion of agricultural land has changed the natural landscape of North Bengal to a great extent. Thus the present study intends to find out long-term changes in maximum and minimum temperature for six northern districts of the state of West Bengal, popularly known as North Bengal. The non-parametric Mann–Kendall test and Theil-Sen’s slope estimator reveals the presence of warming trends in both maximum and minimum temperature. Annual temperature is rising 0.006 C per year and 0.007 C per year at most of the districts for the maximum and minimum temperature respectively. However, the seasonal analysis of trend exposes that post-monsoon and winter temperature rise are predominantly contributing to the upward annual trend. The highest increasing trend in maximum and minimum temperature is observed at Malda (0.013 C per year) in the post-monsoon and winter season respectively. Except the post-monsoon season, the minimum temperature is rising rapidly than maximum temperature across the region. Additionally, Sequential Mann–Kendall test exhibits the periodic fluctuation of trends, which are more prominent in pre-monsoon and monsoon season.
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